package api

import (
	"fmt"
	"net/http"
	"strings"

	"github.com/grafana/grafana/pkg/api/dtos"
	"github.com/grafana/grafana/pkg/models"
	ac "github.com/grafana/grafana/pkg/services/accesscontrol"
	"github.com/grafana/grafana/pkg/services/dashboards"
	"github.com/grafana/grafana/pkg/services/featuremgmt"
	pref "github.com/grafana/grafana/pkg/services/preference"
	"github.com/grafana/grafana/pkg/setting"
)

const (
	// Themes
	lightName = "light"
	darkName  = "dark"
)

func (hs *HTTPServer) editorInAnyFolder(c *models.ReqContext) bool {
	hasEditPermissionInFoldersQuery := models.HasEditPermissionInFoldersQuery{SignedInUser: c.SignedInUser}
	if err := hs.DashboardService.HasEditPermissionInFolders(c.Req.Context(), &hasEditPermissionInFoldersQuery); err != nil {
		return false
	}
	return hasEditPermissionInFoldersQuery.Result
}

func (hs *HTTPServer) setIndexViewData(c *models.ReqContext) (*dtos.IndexViewData, error) {
	hasAccess := ac.HasAccess(hs.AccessControl, c)
	hasEditPerm := hasAccess(hs.editorInAnyFolder, ac.EvalAny(ac.EvalPermission(dashboards.ActionDashboardsCreate), ac.EvalPermission(dashboards.ActionFoldersCreate)))

	settings, err := hs.getFrontendSettingsMap(c)
	if err != nil {
		return nil, err
	}

	settings["dateFormats"] = hs.Cfg.DateFormats

	prefsQuery := pref.GetPreferenceWithDefaultsQuery{UserID: c.UserID, OrgID: c.OrgID, Teams: c.Teams}
	prefs, err := hs.preferenceService.GetWithDefaults(c.Req.Context(), &prefsQuery)
	if err != nil {
		return nil, err
	}

	// Locale is used for some number and date/time formatting, whereas language is used just for
	// translating words in the interface
	acceptLangHeader := c.Req.Header.Get("Accept-Language")
	locale := "en-US"
	language := "" // frontend will set the default language

	if hs.Features.IsEnabled(featuremgmt.FlagInternationalization) && prefs.JSONData.Language != "" {
		language = prefs.JSONData.Language
	}

	if len(acceptLangHeader) > 0 {
		parts := strings.Split(acceptLangHeader, ",")
		locale = parts[0]
	}

	appURL := setting.AppUrl
	appSubURL := hs.Cfg.AppSubURL

	// special case when doing localhost call from image renderer
	if c.IsRenderCall && !hs.Cfg.ServeFromSubPath {
		appURL = fmt.Sprintf("%s://localhost:%s", hs.Cfg.Protocol, hs.Cfg.HTTPPort)
		appSubURL = ""
		settings["appSubUrl"] = ""
	}

	navTree, err := hs.navTreeService.GetNavTree(c, hasEditPerm, prefs)
	if err != nil {
		return nil, err
	}

	if c.IsPublicDashboardView {
		settings["isPublicDashboardView"] = true
	}

	weekStart := ""
	if prefs.WeekStart != nil {
		weekStart = *prefs.WeekStart
	}

	data := dtos.IndexViewData{
		User: &dtos.CurrentUser{
			Id:                         c.UserID,
			IsSignedIn:                 c.IsSignedIn,
			Login:                      c.Login,
			Email:                      c.Email,
			ExternalUserId:             c.SignedInUser.ExternalAuthID,
			Name:                       c.Name,
			OrgCount:                   c.OrgCount,
			OrgId:                      c.OrgID,
			OrgName:                    c.OrgName,
			OrgRole:                    c.OrgRole,
			GravatarUrl:                dtos.GetGravatarUrl(c.Email),
			IsGrafanaAdmin:             c.IsGrafanaAdmin,
			LightTheme:                 prefs.Theme == lightName,
			Timezone:                   prefs.Timezone,
			WeekStart:                  weekStart,
			Locale:                     locale,
			Language:                   language,
			HelpFlags1:                 c.HelpFlags1,
			HasEditPermissionInFolders: hasEditPerm,
		},
		Settings:                            settings,
		Theme:                               prefs.Theme,
		AppUrl:                              appURL,
		AppSubUrl:                           appSubURL,
		GoogleAnalyticsId:                   setting.GoogleAnalyticsId,
		GoogleAnalytics4Id:                  setting.GoogleAnalytics4Id,
		GoogleAnalytics4SendManualPageViews: setting.GoogleAnalytics4SendManualPageViews,
		GoogleTagManagerId:                  setting.GoogleTagManagerId,
		BuildVersion:                        setting.BuildVersion,
		BuildCommit:                         setting.BuildCommit,
		NewGrafanaVersion:                   hs.grafanaUpdateChecker.LatestVersion(),
		NewGrafanaVersionExists:             hs.grafanaUpdateChecker.UpdateAvailable(),
		AppName:                             setting.ApplicationName,
		AppNameBodyClass:                    "app-grafana",
		FavIcon:                             "public/img/fav32.png",
		AppleTouchIcon:                      "public/img/apple-touch-icon.png",
		AppTitle:                            "Grafana",
		NavTree:                             navTree,
		Sentry:                              &hs.Cfg.Sentry,
		Nonce:                               c.RequestNonce,
		ContentDeliveryURL:                  hs.Cfg.GetContentDeliveryURL(hs.License.ContentDeliveryPrefix()),
		LoadingLogo:                         "public/img/grafana_icon.svg",
	}

	if !hs.AccessControl.IsDisabled() {
		userPermissions, err := hs.accesscontrolService.GetUserPermissions(c.Req.Context(), c.SignedInUser, ac.Options{ReloadCache: false})
		if err != nil {
			return nil, err
		}

		data.User.Permissions = ac.BuildPermissionsMap(userPermissions)
	}

	if setting.DisableGravatar {
		data.User.GravatarUrl = hs.Cfg.AppSubURL + "/public/img/user_profile.png"
	}

	if len(data.User.Name) == 0 {
		data.User.Name = data.User.Login
	}

	themeURLParam := c.Query("theme")
	if themeURLParam == lightName {
		data.User.LightTheme = true
		data.Theme = lightName
	} else if themeURLParam == darkName {
		data.User.LightTheme = false
		data.Theme = darkName
	}

	hs.HooksService.RunIndexDataHooks(&data, c)

	// This will remove empty cfg or admin sections and move sections around if topnav is enabled
	data.NavTree.RemoveEmptySectionsAndApplyNewInformationArchitecture(hs.Features.IsEnabled(featuremgmt.FlagTopnav))
	data.NavTree.Sort()

	return &data, nil
}

func (hs *HTTPServer) Index(c *models.ReqContext) {
	data, err := hs.setIndexViewData(c)
	if err != nil {
		c.Handle(hs.Cfg, 500, "Failed to get settings", err)
		return
	}
	c.HTML(http.StatusOK, "index", data)
}

func (hs *HTTPServer) NotFoundHandler(c *models.ReqContext) {
	if c.IsApiRequest() {
		c.JsonApiErr(404, "Not found", nil)
		return
	}

	data, err := hs.setIndexViewData(c)
	if err != nil {
		c.Handle(hs.Cfg, 500, "Failed to get settings", err)
		return
	}

	c.HTML(404, "index", data)
}